Multilayer composite getter

Abstract

A multilayer composite getter, a method for its manufacturing and electrochemical devices for energy storage employing said multilayer composite getters are described.

1. An electrochemical device for energy storage containing
 a solvent, 
 an electrolyte and 
 a multilayer composite getter for hydrogen removal, said multilayer composite getter comprising
 a support essentially formed of a metal getter material with two sides, 
 a layer of palladium or palladium based composites provided on at least one of said sides, defining a coated side, and 
 a hydrogen-permeable protective polymeric layer provided on at least 80% of the surface on the palladium or palladium based composites coated side of the support, wherein the thickness of said protective polymeric hydrogen-permeable layer is comprised in the range of 1 to 100 μm. 
 
 
     
     
       2. The electrochemical device according to  claim 1 , wherein said palladium or palladium based composite is in direct contact with the support. 
     
     
       3. The electrochemical device according to  claim 1 , further comprising a metallic layer disposed between the support and the palladium or palladium based composite layer. 
     
     
       4. The electrochemical device according to  claim 1 , wherein both of said sides of the support are provided with said layer of palladium or palladium based composites. 
     
     
       5. The electrochemical device according to  claim 1 , wherein only one of said sides of the support is provided with said layer of palladium or palladium based composites. 
     
     
       6. The electrochemical device according to  claim 1 , wherein only a portion of the sides of the support is coated with the layer of palladium or palladium based composites. 
     
     
       7. The electrochemical device according to  claim 6 , wherein said portion coated with palladium or palladium based composites is at least 20% of the support. 
     
     
       8. The electrochemical device according to  claim 1 , wherein hydrogen-permeability of the protective polymeric layer is higher or equal to 10 −12 cm 3 cm cm −2 S −1 Pa −1 . 
     
     
       9. The electrochemical device according to  claim 1 , wherein said hydrogen-permeable protective polymeric layer is selected from the group consisting of:
 polyxylenes, polystyrenes, polyalkanes, polydienes, polyoxides, polysiloxanes. 
 
     
     
       10. The electrochemical device according to  claim 9 , wherein said hydrogen-permeable protective polymeric layer is selected from the group consisting of:
 parylene, polystyrenes, polymethyl-1-pentenylene, polyoxydimethylsilylene, polymethyloctylsiloxane, and polydimethylsiloxane. 
 
     
     
       11. The electrochemical device according to  claim 1 , wherein said support is essentially formed of a metal selected from the group consisting of zirconium, yttrium, and titanium. 
     
     
       12. The electrochemical device according to  claim 1 , wherein said palladium based composites are Pd—Ag, Pd—Cu, Pd—V, or Pd—Ni. 
     
     
       13. The electrochemical device according to  claim 1 , wherein the thickness of said support essentially formed of a metal getter material is comprised in the range of 20 to 500 μm. 
     
     
       14. The electrochemical device according to  claim 1 , wherein the thickness of said layer of palladium or palladium based composites is comprised in the range of 10 to 2000 nm. 
     
     
       15. The electrochemical device according to  claim 1 , wherein said polymeric layer is insoluble in the solvent and impermeable with respect to the electrolyte and with respect to the electrolyte components. 
     
     
       16. The electrochemical device according to  claim 15 , wherein said polymeric layer is hydrophobic. 
     
     
       17. The electrochemical device according to  claim 16 , wherein said polymeric layer has a hydrogen permeability which is higher by at least one magnitude order with respect to the permeability to the electrolyte or the components thereof. 
     
     
       18. The electrochemical device according to  claim 1 , wherein said polymeric layer is made of polydimethylsiloxane. 
     
     
       19. The electrochemical device according to  claim 1 , wherein said multilayer composite getter is arranged in the central portion of the device, along the perimeter, or along a portion of the perimeter of the device. 
     
     
       20. The electrochemical device according to  claim 1 , wherein said device is a supercapacitor, or an electrolytic capacitor.